Inverse Proportion

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Bhandaripreeti: Junior | Next Rank: 30 Posts; Posts: 22; Joined: Tue Mar 27, 2007 6:30 am

by Bhandaripreeti » Sat Oct 06, 2007 4:42 am

If c is directly proportional to d and inversely proportional to e, and when and , which of the following is true for all values of c?

1) c=d/e

2) c=de/3

3) c=3d/4e

4) c= 4e/3d

5) c=12e/d

Ans 3

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Source: Beat The GMAT — Problem Solving | Sat Oct 06, 2007 4:42 am

kajcha: Master | Next Rank: 500 Posts; Posts: 321; Joined: Tue Aug 28, 2007 5:42 am; Thanked: 1 times

by kajcha » Sat Oct 06, 2007 6:09 pm

c is directly proportional to d means c = a*d where "a" is a constant

c is inversely proportional to e. means c = b/e where "b" is a constant

together c can be written as

c = a*d*b/e. Only answer choice 3 is in this format.

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gmatguy16: Master | Next Rank: 500 Posts; Posts: 124; Joined: Thu Aug 23, 2007 5:11 am; Thanked: 2 times

by gmatguy16 » Sun Oct 07, 2007 9:32 am

is the question complete,why is the answer not a ?

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